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Lab 8: Dynamically provision file storage on IBM Cloud

Prerequisites

You can retrieve metadata from your OpenShift cluster.

$ oc get nodes
NAME             STATUS   ROLES           AGE   VERSION
10.134.237.197   Ready    master,worker   52d   v1.19.0+e49167a
10.134.237.201   Ready    master,worker   52d   v1.19.0+e49167a
10.134.237.236   Ready    master,worker   52d   v1.19.0+e49167a

Make sure everytime you create resources that you

  • target the right OpenShift cluster
  • target the right OpenShift Project / Kubernetes namespace

Supporting Information

https://cloudnative101.dev/lectures/kube-state-persistence/

https://cloud.ibm.com/docs/containers?topic=containers-file_storage#file_storageclass_reference

https://cloud.ibm.com/docs/containers?topic=containers-file_storage

Challenges to be solved

You need to provide persistent storage for a PostgreSQL deployment via dynamic provisioning.

This persistent storage needs to conform to the following requirements:

  • 20GB storage with 4 IOPS per GB
  • storage should be billed hourly, not monthly
  • storage access is restricted to one pod only (read + write)
  • storage is deployed in the region: eu-de and zone: fra02

Attached the YAML of the PostgreSQL. Besides the Persistent Volume Claim you need to create another Kubernetes Resources to start up the containers in the Kubernetes Pod successfully.

apiVersion: v1
kind: Pod
metadata:
  name: postgresql-pod
  namespace: dev-<YOUR INITIALS>
spec:
  initContainers:
    - name: chmod-er
      image: busybox:latest
      command: ["/bin/chown"]
      args: ["-R", "1001", "/bitnami/postgresql/data"]
      volumeMounts:
        - name: custom-volume
          mountPath: /bitnami/postgresql/data
  containers:
    - name: postgresql
      image: bitnami/postgresql
      volumeMounts:
        - name: custom-volume
          mountPath: /bitnami/postgresql/data
      ports:
        - containerPort: 5432
      env:
        - name: POSTGRESQL_PASSWORD
          valueFrom:
            secretKeyRef:
              name: postgresql-password
              key: POSTGRESQL_PASSWORD
  volumes:
    - name: custom-volume
      persistentVolumeClaim:
        claimName: postgresql-<YOUR-INITIALS>-pvc

Verification

First of all verify that your Persistent Volume Claim is in status "Bound" and examine the details of the PVC. Finally validate that the postgresql container started without errors.

$ oc get pvc
NAME                STATUS
postgresql-gw-pvc   Bound

$ oc describe pvc/postgresql-gw-pvc
Name:          postgresql-gw-pvc
[...]

$ oc describe pod/postgresql-pod
[...]
Events:
  Type    Reason     Age   From                    Message
  ----    ------     ----  ----                    -------
  Normal  Scheduled  27s   default-scheduler       Successfully assigned dev-gw/postgresql-pod to 10.215.17.104
  Normal  Pulling    26s   kubelet, 10.215.17.104  Pulling image "busybox:latest"
  Normal  Pulled     25s   kubelet, 10.215.17.104  Successfully pulled image "busybox:latest"
  Normal  Created    25s   kubelet, 10.215.17.104  Created container chmod-er
  Normal  Started    25s   kubelet, 10.215.17.104  Started container chmod-er
  Normal  Pulling    24s   kubelet, 10.215.17.104  Pulling image "bitnami/postgresql"
  Normal  Pulled     17s   kubelet, 10.215.17.104  Successfully pulled image "bitnami/postgresql"
  Normal  Created    17s   kubelet, 10.215.17.104  Created container postgresql
  Normal  Started    17s   kubelet, 10.215.17.104  Started container postgresql